Workshop

HYDRA-MATIC 6L80 (6 Speed)

Dimension "A"
Dimension "B"
1st Design Reverse Piston
Dimension "A" = Approx 5.138"
Dimension "B" = Approx 5.155"
2nd Design Reverse Piston
Dimension "A" = Approx 5.982"
Dimension "B" = Approx 6.162"
418
417
416
CRITICAL
SEAL SIZE
1-2-3-4 CLUTCH APPLY PISTONS
BOTTOM GROOVE RETAINS THE
3-5 REVERSE CLUTCH INNER SEAL
THIS PISTON GETS TURNED OVER
AND INSTALLED INTO THE
3-5 REVERSE PISTON AS SHOWN
IN FIGURE 92
421
3-5 REVERSE CLUTCH
APPLY PISTON
1-2-3-4 CLUTCH
APPLY PISTON
422
419
416 1-2-3-4 CLUTCH APPLY PISTON SEAL
417 1-2-3-4 CLUITCH APPLY PISTON HOUSING
418 3-5 REVERSE CLUTCH PISTON DAM SEAL
419 3-5 REVERSE CLUTCH PISTON INNER SEAL (1ST DESIGN)
421 3-5 REVERSE CLUTCH APPLY PISTON
422 3-5 REVERSE CLUTCH PISTON OUTER SEAL
AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
57
Copyright © 2007 ATSGCopyright © 2007 ATSG
Figure 93Figure 92
1-2-3-4 AND 3-5 REVERSE HOUSING (CONT'D)
8. Install the seals into the grooves of 3-5 reverse
clutch apply piston and 1-2-3-4 clutch apply
piston, with the small lips facing towards the
groove, as shown in Figure 92.
CAUTION -- CAUTION -- CAUTION
For 2006 & 2007 "Transmission" Model Years, 6L80 units will
be built with a 1st Design 3-5 Reverse Piston, and its
corresponding 1st Design Inner Seal.
For the 2008 "Transmission" Model Year, 6l80 units will be
built with a 2nd Design (Smaller) 3-5 Reverse Piston, and its
corresponding 2nd Design Inner Seal.
Dimensional differences between 1st and 2nd Design pistons
and seals, make them non-interchangeable. Each Design
Level 3-5 Reverse Piston Inner Seal "MUST" be installed only
with its corresponding Design Level 3-5 Reverse Piston. Refer
to Figure 93 for the dimensions of the critical matching parts.
SMALL LIPS
FACING IN
SMALL LIPS
FACING IN
SMALL LIPS
FACING IN

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